Make sure of the IC Type. A PCF8574 (non A) has an upper nibble of 4 for the address and the PCF5874A version has an upper nibble of 7 for the address. NXP did this to allow upto 16 devices on the I2C bus.
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Re: Interfacing with Arduino I2C LCD
Make sure of the IC Type. A PCF8574 (non A) has an upper nibble of 4 for the address and the PCF5874A version has an upper nibble of 7 for the address. NXP did this to allow upto 16 devices on the I2C bus.
Dave Purola,
N8NTA
EN82fn
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